As this site, adnostic.com, disappears (on Sept. 6th). People in this group may want to check out the truenudists website.
There are a couple of atheist groups on that site, although they are not all that active.
Still for nudists and naturists it is a resource.
Also, you may want to check out the phone app Nudist Compass, which you have to download from outside the Apple or Google app stores.
Living in the U.S., I am a member of the American Association for Nude Recreation (AANR), which focuses on family friendly nude recreation, and has many associated clubs across the country.
You may also find local nudist/naturist groups on the Meetup website.
Anyway, I hope these recommendations will help you with resources to find nude recreation groups and places.
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